User manual

Mailing: PO Box 3526, Bellevue, WA. 98009
Shipping: 13737 SE 26
th
St. Bellevue, WA. 98005
Toll Free: 800-259-7331 * Phone: [phone] * Fax: [phone]
www.sgcworld.com * Email: [e-mail]
43
power is being output, you can see the voice modulate the SSB
(the light will flicker with your voice peaks), and you can tune the
transmitter for maximum out-put (if the transmitter is an older
model that requires tuning).
Before building or using the light-bulb dummy load, remember
that these models typically don’t dissipate the transmitter’s output
as well as an oilcan dummy load. The result is that RF will “leak”
out; we have heard a few stories of amateurs who were heard
around town while operating their transmitters into a light-bulb
dummy load. If you use this system, make sure that you test the
equipment on a clear, harmless frequency (NEVER test with the
transmitter set on an emergency frequency, such as 2182 KHz).
SGC recommends that you build the light-bulb dummy load with
the following parts although we have made one with an old light
fixture and a makeshift version with just alligator clip leads and a
light bulb):
•
AC socket to cable with a PL-259 connector (for
transceiver)
• AC socket to cable with alligator clips (needed with
coupler)
• Light bulb to AC adapter
• 75 to 125 watt light bulb, 120 to 220 VAC
• 100 watt radio transceiver
• Any SGC Smartuner or equivalent
ATTENTION: Some retuning may take place as the impedance of the light bulb
varies with the power level. If the power level is held constant with a continuous
carrier such as produced by CW mode operation, the coupler setting will settle after
a short period of time.
Mailing: PO Box 3526, Bellevue, WA. 98009
Shipping: 13737 SE 26
th
St. Bellevue, WA. 98005
Toll Free: 800-259-7331 * Phone: [phone] * Fax: [phone]
www.sgcworld.com * Email: [e-mail]
44
RADIO TEST PROCEDURE
1. Connect the transceiver light bulb load to the radio
RF in/out jack.
2. Turn on the radio and set the CW mode.
3. Key the PTT switch on the microphone and look at
the light bulb. If the light bulb load is connected and
the radio is transmitting, the light should turn on.
4. Set the radio to SSB mode.